Black soot coming from exhaust of D2 V8

**Roverlord off road spares** · 19th June 2017, 10:23 PM

Originally Posted by biggin

Coolant Temperature reads 92deg when warm so no problem there, I would have thought.
Other than the O2 sensor, I can't work out what else would affect only Bank A.
MAF would surely affect both banks.

if it is bank A only, then maybe the injectors are leaking fuel on Bank A ???

**biggin** · 20th June 2017, 04:43 AM

Maybe. But how do I check without pulling them out?
I think I need to pull the plugs. I just haven't had the time to do so yet.
Keep the ideas coming though, much appreciated.

**PhilipA** · 20th June 2017, 07:50 AM

You could get a borescope and have a look in the cylinders.
If it is one or more cylinders there should be a difference to the other ones.
Regards Philip A

**Roverlord off road spares** · 20th June 2017, 09:10 AM

You could pull the plugs and see if any are different, even though you have only traveled a couple of 1000 kms, it might show something, wet? discoloured more than others.

**biggin** · 20th June 2017, 09:43 AM

Fault Code is:
"P0172=mixture adaption factor FRA
bank 1 drive cycle C
occurred 1 times
signal too high
fault is currently present
fault determined as intermittent
fault causes the MIL lamp
activation"

I can't get it to clear, but hoping I can when I do an adaptive reset.

See pics of Nanocom readings.

The "O2 SENS. BANK A" doesn't change. This will be due to carbon deposit. It may come good with a clean.

**biggin** · 20th June 2017, 09:30 PM

Well done Mario, I'm pretty sure the adaptive reset has solved the issue but only time will tell. As soon as I hit the button there was a distinct change in the motor idle, the problematic O2 sensor came to life and both banks are running about the same fuel trim figures.
I could kick myself for not trying it earlier but this has been a good learning experience for me with the Nanocom and it's functionality.
Now on to the next job.......door latches.

**biggin** · 7th August 2017, 08:38 AM

To close out this thread I thought I should give an update.

The O2 sensor replacement followed by the adaptive reset did in fact solve my economy and soot problem. My weekend trip returned about 14l/100km, compared with 22l/100km before the adaptive reset (even with the new O2 sensor installed). Both trips of were highway drives.

Note that this would have been extremely difficult to diagnose and repair without a Nanocom or such like, or without the help of the good people here at AULRO.

After all the work I have done recently the D2 drives like a dream. For now at least.

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